RIGOL Chapter 6 Operations and Measurements
6-6 MSO4000/DS4000 User’s Guide
2. Specify the FFT source
Press Source, turn the multi-function knob to select the desired channel
and press the knob. You can also press Source continuously to switch the
channel currently selected. The channels available are CH1, CH2, CH3 and CH4.
3. Adjust the vertical position and vertical scale
Press
and respectively; turn the multi-function knob to adjust the
vertical scale and vertical position of the FFT operation waveform. Please refer
to “MATH Waveform Vertical Control”.
4. Adjust the horizontal scale and horizontal position
Use HORIZONTAL
SCALE and HORIZONTAL POSITION to adjust
the horizontal scale and horizontal position of the FFT operation waveform
respectively. For the adjustment methods, please refer to “
To Adjust the
Horizontal Time Base” and “To Adjust the Horizontal Position”.
Note: Turning HORIZONTAL
SCALE and HORIZONTAL POSITION
will adjust the horizontal scales and horizontal positions of the analog channel
waveforms and math operation waveform at the same time.
5. Specify the window function
Spectral leakage can be considerably decreased when a window function is used.
MSO4000/DS4000 provides four kinds of FFT window functions (as shown in
Table 6-1
) which have different characteristics and are applicable to measure
different waveforms. You need to select the window function according to the
characteristics of the waveform to be measured.
Press Window, turn the multi-function knob to select the desired window
function and press the knob. You can also press Window continuously to switch
the window function currently selected. The default is “Rectangle”.
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